<template>
    <div class="home-category" @mouseleave="categoryId=null">
      <ul class="menu">
        <li :class="{active:categoryId&&categoryId===item.id}" v-for="item in menuList" :key="item.id" @mouseenter="categoryId=item.id">
          <RouterLink :to="`/category/${item.id}`">{{ item.name }}</RouterLink>
          <template v-if="item.children">
            <RouterLink
              v-for="sub in item.children"
              :key="sub.id"
              :to="`/category/sub/${sub.id}`"
              >{{ sub.name }}</RouterLink
            >
          </template>
          <!-- 骨架 -->
          <template v-else>
            <XtxSkeleton height="18px" width="60px" bg="rgba(255,255,255,0.2)" style="margin-right:5px" />
            <XtxSkeleton height="18px" width="50px" bg="rgba(255,255,255,0.2)"/>
          </template>
        </li>
      </ul>
      <!-- 弹层 -->
      <div class="layer">
        <h4>{{currCategory&&currCategory.id==='brand'?'品牌':'分类'}}推荐 <small>根据您的购买或浏览记录推荐</small></h4>
        <!-- 商品 -->
        <ul v-if="currCategory && currCategory.goods">
          <li v-for="item in currCategory.goods" :key="item.id">
            <RouterLink :to="`/product/${item.id}`">
              <img :src="item.picture" alt="">
              <div class="info">
                <p class="name ellipsis-2">{{item.name}}</p>
                <p class="desc ellipsis">{{item.desc}}</p>
                <p class="price"><i>¥</i>{{item.price}}</p>
              </div>
            </RouterLink>
          </li>
        </ul>
        <!-- 品牌 -->
        <ul v-if="currCategory && currCategory.brands">
          <li class="brand" v-for="brand in currCategory.brands" :key="brand.id">
            <RouterLink to="/">
              <img :src="brand.picture" alt="">
              <div class="info">
                <p class="place"><i class="iconfont icon-dingwei"></i>{{brand.place}}</p>
                <p class="name ellipsis">{{brand.name}}</p>
                <p class="desc ellipsis-2">{{brand.desc}}</p>
              </div>
            </RouterLink>
          </li>
        </ul>
      </div>
    </div>
  </template>

  <script>
  import { computed, reactive, ref } from 'vue'
  import { useStore } from 'vuex'
  import { findBrand } from '@/api/home'
  export default {
    name: 'HomeCategory',
    setup () {
      const store = useStore()
      // 最终使用的数据 = 9个分类() + 1个品牌
      const brand = reactive({
        id: 'brand',
        name: '品牌',
        children: [{ id: 'brand-children', name: '品牌推荐' }],
        // 品牌列表
        brands: []
      })
      const menuList = computed(() => {
        // 得到9个分类切每个一级分类下的子分类只有两个
        const list = store.state.category.list.map((item) => {
          return {
            id: item.id,
            name: item.name,
            children: item.children && item.children.slice(0, 2),
            goods: item.goods
          }
        })
        list.push(brand)
        return list
      })

      // 得到弹出层的推荐商品数据
      const categoryId = ref(null)
      const currCategory = computed(() => {
        return menuList.value.find(item => item.id === categoryId.value)
      })

      // 获取品牌数据，尽量不用使用async再setup上
      findBrand(6).then(data => {
        brand.brands = data.result
      })

      return { menuList, categoryId, currCategory }
    }
  }
  </script>

  <style scoped lang='less'>
  @import '@/assets/styles/variables.less';
  .home-category {
    width: 250px;
    height: 500px;
    background: rgba(0, 0, 0, 0.8);
    position: relative;
    z-index: 99;
    .menu {
      li {
        padding-left: 40px;
        height: 50px;
        line-height: 50px;
        &:hover,&.active {
          background: @xtxColor;
        }
        a {
          margin-right: 4px;
          color: #fff;
          &:first-child {
            font-size: 16px;
          }
        }
      }
    }
    // 弹出层样式
      .layer {
      width: 990px;
      height: 500px;
      background: rgba(255,255,255,0.8);
      position: absolute;
      left: 250px;
      top: 0;
      display: none;
      padding: 0 15px;
      h4 {
        font-size: 20px;
        font-weight: normal;
        line-height: 80px;
        small {
          font-size: 16px;
          color: #666;
        }
      }
      ul {
        display: flex;
        flex-wrap: wrap;
        li {
          width: 310px;
          height: 120px;
          margin-right: 15px;
          margin-bottom: 15px;
          border: 1px solid #eee;
          border-radius: 4px;
          background: #fff;
          &:nth-child(3n) {
            margin-right: 0;
          }
          a {
            display: flex;
            width: 100%;
            height: 100%;
            align-items: center;
            padding: 10px;
            &:hover {
              background: #e3f9f4;
            }
            img {
                width: 95px;
                height: 95px;
            }
            .info {
              padding-left: 10px;
              line-height: 24px;
              width: 190px;
              .name {
                font-size: 16px;
                color: #666;
              }
              .desc {
                color: #999;
              }
              .price {
                font-size: 22px;
                color: @priceColor;
                i {
                  font-size: 16px;
                }
              }
            }
          }
        }
        // 品牌的样式
        li.brand {
          height: 180px;
          a {
            align-items: flex-start;
            img {
              width: 120px;
              height: 160px;
            }
            .info {
              p {
                margin-top: 8px;
              }
              .place {
                color: #999;
              }
            }
          }
        }
      }
    }
    &:hover {
      .layer {
        display: block;
      }
    }
  }
  // 骨架动画
  .xtx-skeleton {
    animation: fade 1s linear infinite alternate;
  }
  @keyframes fade {
    from {
      opacity: 0.2;
    }
    to {
      opacity: 1;
    }
  }
  </style>
